A prototype motor has been designed to meet the 2025 power density goals set by the U.S. Department of Energy targeting an 89% reduction in motor volume compared to 2020 targets.

The research conducted by University of Kentucky, QM Power Inc. (Missouri) and University of North Carolina engineers demonstrated the high torque and speed capability permanent magnet motor technology developed by QM Power. This, combined with advanced manufacturing and cooling technologies, achieved a record-high 50 kW/liter volumetric power density for traction applications such as electric vehicles.

Major challenges associated with existing designs include the overheating and demagnetization of the rotor during system operation. The patented motor design employs no magnets in the rotor, thus minimizing these risks and enabling highly effective direct cooling of magnets in the stator.

“The unique topology of this motor enables lighter, smaller electric motors which are more efficient and easier to manufacture,” said Madhav Manjrekar of QM Power. “These motors are expected to offer superior performance in terms of torque production and achieve more miles per charging cycle, thus enabling electric transportation at much lower costs.”

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